Work-support.



W. H. BORDEN.

WORK SUPPORT.

APPLICATION FILED APR. I4. 1914.

Patented Jan. 15, 1918.

WILLIAM H. BURDEN, OF WINCHESTER, MASSACHUSETTS, ASSIGNOR, IBY MESNE ASSIGNMENTS, TO UNITED SHOE MACHINERY CORPORATION, OF PATERSON NEW JERSEY, A CORPORATION OF NEW JERSEY.

To all whom it may concern:

Be it known that I, lVILLmM H. BORDEN, a citizen of the United States, residing at lVinchester, in the county of Middlesex and State of Massachusetts, have invented certain Improvements in VVork-Supports, of which the following description, in connection with the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts in the several. figures.

This invention relates to last supports for nailing and other shoe machines and more particularly to last pins and last pin holders for jacks. The inventionis shown as embodied in a jack of the type disclosed in United States Letters Patent to V. H. (luff, No. 919,424, granted April 27, 1909, but it will be apparent that the usefulness of the invention is not restricted to the illustrated embodiment.

It is practically essential that certain operations upon the better grades of shoes, such, for example, as heel seat nailing, be performed while the shoe is upon the last. To this end various types of last supports, commonly known as jacks, have been designed, the most usual type comprising a spindle arranged to swing in an arc of long radius and carrying at its upper end a last pin which enters a last pin socket in the heel end of the last.

The principal difliculty experienced in the use of jacks of the type just describedarises from the lack of uniformity in the location of the last pin sockets in lasts, whereby a last, when placed upon the last pin of the jack may be inclined at an angle which makes difficult the proper presentation of the shoe to the machine. This is particularly true with respect to nailing and slugging machines in which the work is clamped at the time of the nailing or slugging operation and in which therefore the bottom sur face of the last must be substantially parallel to the abutment upon the machine against which the shoe is clamped.

Various attempts have been made to overcome the difficulties in handling lasted work, some of the attempts to solve the problem being directed to making more universal the movement of the jack as a whole and others being directed to providing greater adjust a l y a te t ai with re ect to the Specification of Letters Patent.

Application filed April 14, 1914. Serial No. 831,864.

spindle of the jack. Some of these attempts to solve the problem have met with limited success and have improved the quality of the work produced by certain machines.

Up to the time of the present invention, however, the problem of providing at the upper end of a jack a light, compact, strong and positive universally tiltable last pin had not been satisfactorily solved. An object of the present invention, therefore, is to provide such a last pin construction and particularly to provide a simple, compact and practicable universally tiltahle last pin for jacks which will so adapt itself to variations in the last that the shoe to be operated upon may be presented at the proper angle to the driving instrumentalities of the fastening inserting machine or to the operating part of any other type of machine with which the jack may be associated, regardless of the inclination of the last pin socket to the bottom face of the last and regardless of other inaccuracies in the construction of the last.

Another object of the invention is the provision of improved means for automatically looking a tiltable last pin against lateral movement when pressure is exerted longitudinally on the last pin, as for example when the work is being clamped, and, par ticularly, the provision of such means in combination with a last pin which has an unrestricted lateral tipping movement at all times.

Other objects and important features of the invention will appear from the following description and claims when considered in connection with the accompanying drawings, in which a preferred embodiment. of theinvention is illustrated.

In the drawings:

Figure 1 is a perspective showing the last pin of the present invention and a portion of its supporting jack and the location of the last pin with respect to the machine;

Fig. 2 is a view showing the last pin holder in vertical section and the last pin therein; 7

i Fig. 3 is a plan view of the last pin and last pin holder;

Fig. 4 is a sideelevation of the upper end of the last support showing last in position. i

Inthe dra ing e iaclesa yi s P 2, which of usual cpnstruction, isadapteol to slide up and down in a bearing 3 on the machine frame and has clamped to its upper end a jack supporting bracket 5 to which the jack spindle 6 is movablyconnected, all as set forth in the above-mentioned patent.

Pivoted in the slotted upper end of the jack spindle G on the bolt 7 is one member 8 of the last pin holder, the lower end of this member being provided with a series of worm teeth 9 engaging the teeth of a worm screw mounted in the spindle 6 whereby the angular relation of the holder and spindle may be changed according to the requirements of the work. The last pin 13 hasa shoulder 15 which engages the crown of the last and a depending shank portion 16 which is received in a substantially large and elongated socket 18 extending longitudinally into the last pin holder. The bottom of this socket is preferably spherically eoncaved and retains therein a freely movable concavo-convex bearing member 19 upon which the last pin 13 is supported. The outer or convex surface 20 of he bearing member 19 is of the same radius as'the bottom surface of the socket nd the inner or concave surface 22 is of the same as the engaging spherical lower end of the last pin 13, the member 19 thus constituting a wedge bearing which is interposed between the bot tom of the socket and the lower end of the last pin 13. The shank 16 of the last pin below the shoulder 15 is rotatably confined in an axial bore through a spherical or ball shaped bearing 23 which is seated in a correspondingly shaped recess 25 in the upper end of the socket 18 and held in place in the recess by a cap 26 which is threaded 011 1 0 he upper end of the member 8 of the holder. By mountingthe last pin 13 in this manner it will be seen that it has an unrestricted lateral movement in all directions and at all times.

A spring pressed plunger 28 located in a recess provided in the member 8 of the holder and below the bearing 23 projects into the socket 18 and engages a comparatively wide annular groove 30 in the shank 16 of the last pin and acts normally to tilt:

the pin about the center of the ball-shaped bearing 23 into a position in which the last pin 13 i inclined away from the machine to facilitate the removal of the shoe from its support, the plunger 28 also preventing the accidental removal of the last pin 13 from the last pin holder particularly when the last pin binds in the last hole of the last. A sleeve 27 threaded on to the member 8 of the last pin holder retains the plunger 28 in the recess therein and serves to, lock the cap 26 in position on the member 8 to allow the last pin to be readily tilted.

In practice the last carrying the shoe is applied. to the last pin 13 and supported thereonby the flange 15 which engages the crown of the last. The shoe is then moved in under the nose plate 32 of the machine. The last pin, beingnniversally tiltable in the holder,- may be tippedfreely in the required direction to present the shoe bottom properly to the machine (Fig. 4:). The tilting of the last pin in the holder about the center of the bearing 23, which center, as shown, is eccentric to the convex bearing surface at the lower end of the last pin, causes the eoncavo-convex bearing 19 interposed between the end of the-last pin and the bottom of the socket to adjust itself to the particular position of the end of the last pin in the socket, (Fig. 2), the bearing 19 thus providing a constant positive supagainst lateral movement. It will be oh viou that any increased longitudinal pressure on the last pin will increasethe locking action on the pin. we I Having described my invention with particular reference to a preferred embodiment thereof, what I claim and desire to secure by Letters Patent is 1. Ina work support, a last pin mounted for unrestricted lateral tipping .movement at all times, a holder for said pin, and means affording a constant positive support for the pin against longitudinal thrusts, said means being constructed and arranged automatically to lock said pin in any one of its-tilted positions against lateral movement when pressure is exerted. substantially longitudinally on the pin.

2. In a work support, a last pin. mounted for unrestricted lateral tipping movement at all times, a holder provided with'a socket for said pin, and means acting normally to support the pin unyieldingly against longitudinal thrusts when in any tilted position in said socket, said means normally permitting free lateral movement of the pin but being constructed to lock the pin against lateral movement when pressure is exerted longitudinally on the'pin. Y

3. In a work support, a last pin holder provided with a socket, a universally tiltable last pin the lower end of which has re stricted lateral movement in-all directions 9 4. In a work support, a last pin holder provided with a socket extending longitudinally thereof, a universally tiltable last pin the lower end of which has restricted lateral movement in all directions in said socket, and a bearing loosely contained in said socket and shaped to aiford a constant support for said pin in any position and to prevent lateral movement of said pin when pressure is exerted longitudinally on the pin.

5. In a work support, a last pin holder provided with a socket, a bearing freely movable in said socket, a last pin directly engaging said bearing and universally tiltable in said socket, and a spring-pressed plunger engaging a groove in said pin to detachably retain said pin in said holder and hold said pin normally inclined with respect to the last pin holder.

6. In a work support, a last pin holder provided with a socket, abearing freely movable in said socket, a last pin directly engaging said bearing and universally tiltable in said socket, and a spring-pressed plunger engaging a groove in said pin to detachably retain said pin in said holder while permitting the pin to tilt universally therein.

7. In a work support, a last pin holder provided with a socket extending longitudinally thereinto, a bearing freely movable in the bottom of said socket, a last pin unyieldingly supported by said bearing, and a spherical bearing seated in said holder and about the center of which the last pin is freely tiltable in all directions in said socket.

S. In a work support, a last pin holder provided with a socket extending longitudinally thereinto, a bearing freely movable in the bottom of said socket, a last pin unyieldingly supported by said bearing, and a spherical bearing adjacent to the upper end of said socket and about the center of which the last pin is tilt-able laterally in all directions, said first mentioned bearing being constructed to cooperate with said socket to automatically lock said pin against lateral movement when pressure is exerted longitudinally on the pin.

9. In a work support, a last pin holder having formed therein a cylindrical socket having a spherically concaved bottom, a concavo-convex bearing member fitting into and resting upon said bottom, and a last pin having at its lower end a convex bearing surface of substantially the same radius as the concavity in said bearing member, said last pin resting in said concavity.

10. In a work support, a last pin holder having formed therein a cylindrical socket having a spherically concaved bottom, a concave-convex bearing member fitting into and resting upon said bottom, a last pin having at its lower end a convex bearing surface of substantially the same radius as the concavity in said bearing member, said last pin resting in said concavity, and a universal bearing seated in said holder and in which said last pin is confined for tilting movement about a center eccentric to the convex bearing surface at the lower end of said pin.

11. In a work support, a last pin holder provided with a socket extending longitudinally thereinto, a universally tiltable last pin the lower end of which has restricted lateral movement in all directions in said socket, and a bearing having eccentric bearing surfaces and upon which the last pin rests in said socket, said bearing being universally movable with respect to the pin and the socket and said bearing surfaces being constructed and arranged to cooperate respectively with the walls of said socket and the end of said pin to lock said pin against lateral movementwhen pressure is exerted longitudinally on the pin.

12. In a work support, a last pin holder provided with a socket, a universally tiltable last pin the lower end of which has restricted lateral movement in all directions in said socket, and means for supporting the last pin in said socket, said means being constructed and arranged to cooperate with the walls of said socket automatically to lock said pin in any of its tilted positions against lateral movement when pressure is exerted longitudinally on the pin.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

IVILLIAM I-I. BORDEN.

Witnesses HENRY RAI-ILMEYER, IVILLIAM B. KING.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). 0. 

